Sole and welt pricking machine



(No Model.) 2 Sheets-Sheet 1.

' H. L. DREW.

SOLE AND WELT PRIGKING MACHINE.

Patented Dec. 18,1881.

iifllillll lllll (No Model.) 2 Sheets-Sheet 2.

H. L. DREW.

. SOLE AND WELT PRIGKING MACHINE.

No. 250,900. Patented Dec. 13,1881.

l ll-lllllln ulull UNITED STATES PATENT rare.

HENRY L. DRINV, OF ROOKLAND, ASSIGNOR TO J OHN W. HART, OF WEYMOUTH, MASSACHUSETTS.

SOLE AND WELT PRICKING MACHINE.

v SPECIFICATION forming part of Letters Patent No. 250,900, dated December 13, 1881.

Application filed October 28, 1881. (No model.)

To all whom it may concern:

Be it known that I, HENRY L. DREW, of Rocklanchin the county ofPlymouth and State of Massachusetts, have invented a new and useful Improvement in YVelt and Outer-Sole Pricking Machines, of which the following is a specification.

-My invention relates to improvements in pricking-machines, especially to those in which two reciprocating awls puncture the welt and outer sole of a boot or shoe preparatory to inserting the thread.

The objects of my invention are, first, to prick the holes by means of a curved awl and a straight awl; second, to provide an automatically-adjustable presser-t'oot to act in concert with the awls and vary its stroke according to the thickness of the material to be pricked..

In the accompanying drawings, Figure l is a side elevation of the head of a machine with my improved awl and presser-footmechanism. Fig. 2 is a front view of the same. Fig. 3 is an elevation of the side opposite that shown in Fig. 1. Fig. 4 is a sectional view of the clutch mechanism operating the presser-bar.

The presser-foot bar A is reciprocated in the head B by the lever G, which is actuated as usual in sewing-machines. The awl-carrier D, instead of reciprocating verticallyin the same head and parallel with the presserfoot bar A, is journaled at d, and receives its motion from the lever E through a rod, 0, connecting the long arm of the awlcarrier D with the lever E, as shown in Fig. 1. The connecting-rod e is adjustable as to its length by means of a sleeve-nut, c, which is provided with right and left hand screw-threads, which engage with corresponding threads on the two parts of the rod 0. The short arm of the awl-carrier D is curved, as shown, so as to allow it to work close to the upper oi the boot or shoe, and carries a curved awl, d, secured by' the set-screw 61 The other awl,.d is operated in the same way as the needle in a waxthread sewing-machine, so that the motions of the two awls are similar to the motions of the awl and needle in said machine, but being limited in this machine, so that the point of the curved awl will pass slightly below the middle of the material until it nearly meets the point of the other awl, and then rise rapidly, the other awl following more slowly until its point enters the aperture made by the curved awl. When the curved awl is raised out of the way the material is fed along the proper distance by the sidewise motion of the straight awl. The straight awl is then brought backto its former position in time to co-operate with the curved awl, its motions to feed the material being the same as the feed motions of the needle in the sewing-machine above referred to, and the same mechanism being used.

To render the presser-foot bar A automatically adjustable, so as to adapt its rise to the varying thickness of the material to be punctured, two clutches, g g, are placed on the presser-foot barA,with their arms extending through a slot in the head B and in the path of the end of the presser-footlever Gr. Each of these clutches has a spring, 9 acting on the end of its arm, to keep it from contact with the presser-foot bar A when not pressed on by the lever G. The lower clutch, g,- is held in its proper position by the screw 9 The upper clutch,g, rests on the head of a bolt,g which is adjusted by the nut 9 so as to bring the upper clutch, g, to its proper position. A spring, causes the upper clutch to follow the lever G downward until it strikes the head of the bolt 9 In operationthe lower clutch is adjusted so that the downstroke of the lever G will cause it to gripe the presser-foot bar and prevent its rising, the duration of this gripe being regulated by the cam that actuates the lever G. In its upward motion the lever G releases the lower clutch, and causes the upper clutch to gripe the presser-foot bar, so that it is compelled to rise and remain at its highest point as long as the lever G is up. By this arrangement of clutch devices which gripe the presser-foot bar only when pressed on by the leverG and leave it free to be thrown down by its spring a, when not so pressed, varied thicknesses of material can be punctured, the presser-foot always preventing the material from rising when the lower awl rises, and always rising thesame distance above the material when it is fed along.

In the drawings 1 have shown my improvements as attached to the sewin g-machine called the New England, thelevers G and E being actuated. as in that machine, and the straight awl d being actuated in the same Way as the 5 needle of that machine.

What 1 claim as my invention is- 1. In combination, the awl 01*, for partially pricking and feeding the material and the curved awl d, secured to the curved arm of 10 awl-carrier D and suitable actuating mechanism, substantially as and for the purposes set forth.

2. In combination with the resser-foot, its bar A and spring a, the clutch devices g g and reciprocating lever G, substantially as and I 5 for the purposes set forth.

HENRY L. DREW.

WVitnesses:

WM. A. COPELAND, JOHN R. SNOW. 

